If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Xilitla: The hottest months are usually May and June, with an average temperature of 24°C, while the coldest months are January and December, with an average of 17°C. The rainiest months in Xilitla are September, June, October and July, with each month seeing an average of 199 mm of rainfall.